pfi_get_ifaces
int pfi_get_ifaces(const char *, struct pfi_kif *, int *);
if (pfi_get_ifaces(filter, b.pfrb_caddr, &b.pfrb_size)) {
error = pfi_get_ifaces(io->pfiio_name, io->pfiio_buffer,
int pfi_get_ifaces(const char *, struct pfi_kif *, int *);